Katsura infiltrates the Shinsengumi in a bid to take it down from the inside, but he finds he has an unexpected foe to deal with.
In which case, having 
them truly become friends
وفي تلك الحالة، مصادقتهما بحق
En ese caso, quizás lo más rápido 
sea hacer que se conviertan en amigos.
Sendo assim, talvez fazer com
 que eles sejam amigos